Key Highlights

● Penguin slid on October 22, joining a retreat in AI infrastructure stocks.

● Penguin had no company-specific news.

● Lam guided December-quarter revenue to $8.6 billion, plus or minus $400 million.

● The Philadelphia Semiconductor Index closed just above its 200-day moving average.

Shares of Penguin Solutions (NASDAQ:PENG) slid on Thursday, October 22, 2026, joining a broad retreat in AI infrastructure and chip stocks that dragged the Nasdaq Composite to its steepest drop since June 5.

Penguin had no company-specific news. Instead, the stock moved with its sector, alongside chip-related shares including Applied Materials (NASDAQ:AMAT), Lam Research (NASDAQ:LRCX), KLA (NASDAQ:KLAC) and FormFactor (NASDAQ:FORM), pointing to the shared catalyst of Lam's outlook.

The Lam read-through

Lam Research, one of the world's biggest makers of chip-manufacturing equipment, reported its results after Wednesday's close. Revenue reached a record $8.22 billion and adjusted earnings per share of $2.20 beat forecasts. But its guidance for the December quarter, revenue of $8.6 billion plus or minus $400 million, had a midpoint slightly below consensus, and the company cited supply constraints.

Lam's management warned that the bottlenecks would persist. Lam said upstream parts shortages and certified clean-room constraints "continue to curb manufacturing velocity" and would last into 2027. Lam's chief executive said those constraints would "limit chip makers and equipment companies' ability to fully meet end demand."

Lam's shares tumbled, and the selling spread across the industry. The Philadelphia Semiconductor Index had its biggest one-day drop since June 23. Nvidia (NASDAQ:NVDA) was one of the biggest drags on the S&P 500, according to market reports.

Why Penguin was caught up

Penguin is grouped with semiconductor and AI infrastructure stocks, a part of the market whose fortunes are closely tied to spending on AI data centers.

Thursday's selloff was as much about that spending as about supply. Meta Platforms (NASDAQ:META), which reported after Wednesday's close, narrowed its 2026 capital expenditure range to $135 billion to $145 billion and reported negative free cash flow, its first cash outflow in more than a decade, according to market data. Investors grew more anxious about whether such heavy spending can be sustained and financed.

Nvidia's chief executive added to that concern. "The demand of the capital is much greater than the availability of the capital," he said. CoreWeave (NASDAQ:CRWV), a provider of AI cloud computing, fell sharply on debt and cost-of-capital worries.

Smaller AI infrastructure stocks often move more than their larger peers when sentiment shifts. Other small and mid-cap chip names, including FormFactor, MACOM (NASDAQ:MTSI), Semtech (NASDAQ:SMTC) and Vishay (NYSE:VSH), also slid.

A broad tech retreat

The Nasdaq Composite closed at 26,008.86, down 694.00 points. The fall ended a seven-session winning streak and erased about $1 trillion in market value, according to market data.

The rest of the market fared better. About two of every three S&P 500 stocks rose, according to market reports, as investors moved into consumer staples, health care, utilities and homebuilders. Treasuries rallied, sending the 10-year yield back below a closely watched threshold for the first time since September 22.

Penguin Watches the Chip Index's Support Level

Investors will watch whether chip and AI infrastructure stocks stabilize after Thursday's rout. The Philadelphia Semiconductor Index closed just above its 200-day moving average, a level traders often watch. Next week's earnings from Microsoft (NASDAQ:MSFT) and Alphabet (NASDAQ:GOOGL) on October 28 and Amazon (NASDAQ:AMZN) on October 29 will offer fresh signals on AI spending plans. The Federal Reserve announces its decision on Wednesday, October 28.